<template>
	<el-menu :default-active="activeMenu" mode="horizontal" @select="handleSelect">
		<template v-for="(item, index) in topMenus">
			<el-menu-item :style="{ '--theme': theme }" :index="item.path" :key="index" v-if="index < visibleNumber">
				<svg-icon v-if="item.meta && item.meta.icon && item.meta.icon !== '#'" :icon-class="item.meta.icon" />
				{{ item.meta.title }}
			</el-menu-item>
		</template>

		<!-- 顶部菜单超出数量折叠 -->
		<el-submenu :style="{ '--theme': theme }" index="more" v-if="topMenus.length > visibleNumber">
			<template slot="title">更多菜单</template>
			<template v-for="(item, index) in topMenus">
				<el-menu-item :index="item.path" :key="index" v-if="index >= visibleNumber">
					<svg-icon v-if="item.meta && item.meta.icon && item.meta.icon !== '#'" :icon-class="item.meta.icon" />
					{{ item.meta.title }}
				</el-menu-item>
			</template>
		</el-submenu>
	</el-menu>
</template>

<script>
import { constantRoutes } from '@/router';

// 隐藏侧边栏路由
const hideList = ['/index', '/user/profile'];

export default {
	data() {
		return {
			// 顶部栏初始数
			visibleNumber: 5,
			// 当前激活菜单的 index
			currentIndex: undefined,
		};
	},
	computed: {
		theme() {
			return this.$store.state.settings.theme;
		},
		// 顶部显示菜单
		topMenus() {
			let topMenus = [];
			this.routers.map((menu) => {
				if (menu.hidden !== true) {
					// 兼容顶部栏一级菜单内部跳转
					if (menu.path === '/') {
						topMenus.push(menu.children[0]);
					} else {
						topMenus.push(menu);
					}
				}
			});
			return topMenus;
		},
		// 所有的路由信息
		routers() {
			return this.$store.state.permission.topbarRouters;
		},
		// 设置子路由
		childrenMenus() {
			var childrenMenus = [];
			this.routers.map((router) => {
				for (var item in router.children) {
					if (router.children[item].parentPath === undefined) {
						if (router.path === '/') {
							router.children[item].path = '/' + router.children[item].path;
						} else {
							if (!this.ishttp(router.children[item].path)) {
								router.children[item].path = router.path + '/' + router.children[item].path;
							}
						}
						router.children[item].parentPath = router.path;
					}
					childrenMenus.push(router.children[item]);
				}
			});
			return constantRoutes.concat(childrenMenus);
		},
		// 默认激活的菜单
		activeMenu() {
			const path = this.$route.path;
			let activePath = path;
			if (path !== undefined && path.lastIndexOf('/') > 0 && hideList.indexOf(path) === -1) {
				const tmpPath = path.substring(1, path.length);
				activePath = '/' + tmpPath.substring(0, tmpPath.indexOf('/'));
				if (!this.$route.meta.link) {
					this.$store.dispatch('app/toggleSideBarHide', false);
				}
			} else if (!this.$route.children) {
				activePath = path;
				this.$store.dispatch('app/toggleSideBarHide', true);
			}
			this.activeRoutes(activePath);
			return activePath;
		},
	},
	beforeMount() {
		window.addEventListener('resize', this.setVisibleNumber);
	},
	beforeDestroy() {
		window.removeEventListener('resize', this.setVisibleNumber);
	},
	mounted() {
		this.setVisibleNumber();
	},
	methods: {
		// 根据宽度计算设置显示栏数
		setVisibleNumber() {
			const width = document.body.getBoundingClientRect().width / 3;
			this.visibleNumber = parseInt(width / 85);
		},
		// 菜单选择事件
		handleSelect(key, keyPath) {
			this.currentIndex = key;
			const route = this.routers.find((item) => item.path === key);
			if (this.ishttp(key)) {
				// http(s):// 路径新窗口打开
				window.open(key, '_blank');
			} else if (!route || !route.children) {
				// 没有子路由路径内部打开
				const routeMenu = this.childrenMenus.find((item) => item.path === key);
				if (routeMenu && routeMenu.query) {
					let query = JSON.parse(routeMenu.query);
					this.$router.push({ path: key, query: query });
				} else {
					this.$router.push({ path: key });
				}
				this.$store.dispatch('app/toggleSideBarHide', true);
			} else {
				// 显示左侧联动菜单
				this.activeRoutes(key);
				this.$store.dispatch('app/toggleSideBarHide', false);
			}
		},
		// 当前激活的路由
		activeRoutes(key) {
			var routes = [];
			if (this.childrenMenus && this.childrenMenus.length > 0) {
				this.childrenMenus.map((item) => {
					if (key == item.parentPath || (key == 'index' && '' == item.path)) {
						routes.push(item);
					}
				});
			}
			if (routes.length > 0) {
				this.$store.commit('SET_SIDEBAR_ROUTERS', routes);
			} else {
				this.$store.dispatch('app/toggleSideBarHide', true);
			}
		},
		ishttp(url) {
			return url.indexOf('http://') !== -1 || url.indexOf('https://') !== -1;
		},
	},
};
</script>

<style lang="scss">
.topmenu-container.el-menu--horizontal > .el-menu-item {
	float: left;
	height: 50px !important;
	line-height: 50px !important;
	color: #999093 !important;
	padding: 0 5px !important;
	margin: 0 10px !important;
}

.topmenu-container.el-menu--horizontal > .el-menu-item.is-active,
.el-menu--horizontal > .el-submenu.is-active .el-submenu__title {
	border-bottom: 2px solid #{'var(--theme)'} !important;
	color: #303133;
}

/* submenu item */
.topmenu-container.el-menu--horizontal > .el-submenu .el-submenu__title {
	float: left;
	height: 50px !important;
	line-height: 50px !important;
	color: #999093 !important;
	padding: 0 5px !important;
	margin: 0 10px !important;
}
</style>
